#!/usr/bin/env/python3
# -*- coding:utf-8 -*-


def _private_1(name):
    return 'Hello,%s' % name


def _private_2(name):
    return 'Hi,%s' % name


def greeting(name):
    if len(name) > 3:
        return _private_1(name)
    else:
        return _private_2(name)



name = input('请输入名字')

print(greeting(name))